<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
   <style>
       #l1{ color: green}
       .c1{color: blue}
        h1{background-color: yellow}
       input[type='submit']{background-color: red}
       input[type='button']{color: pink}
       *{
           border: 1px solid red;
       }
   </style>

</head>
<body>
<ul>
  <li id="l1">张学友</li>
  <li class="c1">刘德华</li>
  <li>郭富城</li>
</ul>
<h1 class="c1">悟空</h1>
<h1>八戒</h1>
<h1>沙僧</h1>
<h1>刘备</h1>
<input type="submit" >
<input type="button" value="按钮">
</body>
</html>